I'm not particularly convinced this solves any problem whatsoever. There are dozens of vendors for the AR-15 for example and they tend to generally all look more or less the same in any given class. Likewise there are only a handful of ways one can illustrate an automatic pistol or revolver. Ensuring there isn't a real world counterpart does virtually nothing as the weapon will still end up looking more or less like a firearm already on the market.
Of course, aside from the AR series, the vast majority of weapons that show up in video games are only loosly available to the public. One can purchase the P-90 but unless one has a (very expensive) permit, they can only purchase the P-90c which only features a semi-automatic mode. This tends to be true for any exotic weapon you can point to and such weapons tend to be staggeringly expensive if available at all. Many European and Asian weapons are only available in the US through odd loopholes in the import laws for example ensuring that actually getting such a weapon that functions well can be both difficult (in terms of simply locating an example) and expensive. Other weapons simply aren't available - the French FAMAS for example.
Of course, aside from the AR series, the vast majority of weapons that show up in video games are only loosly available to the public. One can purchase the P-90 but unless one has a (very expensive) permit, they can only purchase the P-90c which only features a semi-automatic mode. This tends to be true for any exotic weapon you can point to and such weapons tend to be staggeringly expensive if available at all. Many European and Asian weapons are only available in the US through odd loopholes in the import laws for example ensuring that actually getting such a weapon that functions well can be both difficult (in terms of simply locating an example) and expensive. Other weapons simply aren't available - the French FAMAS for example.